102 



perhaps some hydrated calcium chloride molecules, calcium ions, chlorine 

 ions, calcium hydroxide molecules, hydrochloric acid molecules, hydrogen 

 ions, hydroxyl ions. 



Of these ingredients water can hardly be the active agent, or equally 

 marked results would have been obtained in the other cases; of the 

 other chemical substances present, all but calcium chloride molecules^ — 

 anhydrous and hydrated — were present in approximately equal quantities 

 in other solutions tested without corresponding results. The action, then, 

 must be considered catalytic, on account of the quantities involved, and 

 induced by calcium chloride molecules, anhydrous or hydrated, and is 

 apparently the hydrolysis of the silicates of the glass, with the forma- 

 tion of more or less hydrated silica and free basis. 



